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Check for __mprotect failure in _dl_map_segments [BZ #20831]

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* elf/dl-map-segments.h (_dl_map_segments): Check for failure
of __mprotect to change protection on the excess portion
to disallow all access.
This commit is contained in:
Dmitry V. Levin 2016-11-16 22:49:25 +00:00
parent bf7730194f
commit 9ace4692b2
2 changed files with 19 additions and 8 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2017-04-09 Dmitry V. Levin <ldv@altlinux.org>
[BZ #20831]
* elf/dl-map-segments.h (_dl_map_segments): Check for failure
of __mprotect to change protection on the excess portion
to disallow all access.
2017-04-07 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/i386/fpu/fclrexcpt.c (__feclearexcept): Use

20
elf/dl-map-segments.h
View File

@ -64,14 +64,18 @@ _dl_map_segments (struct link_map *l, int fd,
l->l_addr = l->l_map_start - c->mapstart;
if (has_holes)
/* Change protection on the excess portion to disallow all access;
the portions we do not remap later will be inaccessible as if
unallocated. Then jump into the normal segment-mapping loop to
handle the portion of the segment past the end of the file
mapping. */
__mprotect ((caddr_t) (l->l_addr + c->mapend),
loadcmds[nloadcmds - 1].mapstart - c->mapend,
PROT_NONE);
{
/* Change protection on the excess portion to disallow all access;
the portions we do not remap later will be inaccessible as if
unallocated. Then jump into the normal segment-mapping loop to
handle the portion of the segment past the end of the file
mapping. */
if (__glibc_unlikely
(__mprotect ((caddr_t) (l->l_addr + c->mapend),
loadcmds[nloadcmds - 1].mapstart - c->mapend,
PROT_NONE) < 0))
return DL_MAP_SEGMENTS_ERROR_MPROTECT;
}
l->l_contiguous = 1;